Electron tube including a cathode having an electron emissive ma

Details Electron tube including a cathode having an electron emissive ma Electron tube including a cathode having an electron emissive ma

1996-09-09

1998-09-15

Patel, Ashok

Electric lamp and discharge devices

Electrode and shield structures

Cathodes containing and/or coated with electron emissive...

313346DC, 313337, H01J 120

Patent

active

058084045

ABSTRACT:
A cathode for an electron tube has an electron emissive material layer on the surface of a cathode base metal. The electron emissive material layer has a three-layer structure composed of a first layer made of an alkaline earth metal oxide which is formed on the surface of the cathode base metal, a second layer which is an alkaline earth metal oxide layer in which a rare earth metal oxide is dispersed, which is formed on the surface of the first layer, and a third layer made of an alkaline earth metal oxide which is formed on the surface of the second layer.

REFERENCES:
patent: 4291252 (1981-09-01), Aida et al.
patent: 4404492 (1983-09-01), Palty
patent: 4737679 (1988-04-01), Yamamoto et al.
patent: 4823044 (1989-04-01), Falce
patent: 4855637 (1989-08-01), Watanabe et al.
patent: 5118984 (1992-06-01), Saito et al.
patent: 5216320 (1993-06-01), Koizumi et al.

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